B3876
DTC B3876
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.
DTC Descriptor
DTC B3876 5A
- Front Wiper Park Switch Signal not Plausible
Diagnostic Fault Information
Circuit/System Description
The windshield wiper park signal is an input to the Underhood Electrical Center (UEC) and a input to the rainsensor . It is a 'ground' signal when the wiper is in park position and 'open' when the wiper is in a wipe cycle. To indicate the reaching of the park position, the UEC sends the signal Windshield Wiper Park Position Active to the rainsensor, otherwise Inactive. The UEC also send Windshield Wiper Park Position Active to the CAN bus. The timing depends on the CAN bus .
Conditions for Running the DTC
* Battery voltage must be between 9-16 volts.
* Ignition switch in any power mode.
Conditions for Setting the DTC
* Active wiper and no park signal for 20 seconds.
* Active wiper and no release of wiper park signal for 20 seconds.
Actions Taken When the DTC Sets
If the Wiper is in a Wipe Cycle and the Park Position Signal does not become active or inactive within a programed time out default the Wiper goes into the Error Mode. In the Error Mode, the UEC drives the Wiper in the corresponding speed (Low or High) until the Steering Wheel Module sends Windshield Wiper Switch Activation = Off. Then the Wiper will be stopped immediately, regardless of the position on the windshield. It is possible to drive the wiper into any position with activation of Pulse/Mist.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 malfunction-free ignition cycles have occurred.
Reference Information
Schematic Reference
Wiper/Washer Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Wiper/Washer System Description and Operation (Wiper/Washer System Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information
Circuit/System Testing
1. Ignition OFF, install scan tool.
2. Disconnect wiring harness at wiper motor.
3. Ignition ON.
4. With scan tool monitor the wiper motor Park switch status should display as INACTIVE
• If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the UEC.
5. Connect a fused jumper wire between terminal 3 and ground at the wiper motor harness connector. Park switch status should display ACTIVE.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the UEC.
6. Ignition OFF, measure resistance between wiper motor harness terminal 4 and Ground. Verify resistance is less than 0.3 Ohm .
• If not the specified value, test the ground circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the wiper motor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Windshield Wiper System Module Replacement (Windshield Wiper System Module Replacement)
* Control Module References (Programming and Relearning)for REC replacement, setup, and programming